634779663 has 24 divisors (see below), whose sum is σ = 986689152. Its totient is φ = 361945584.

The previous prime is 634779623. The next prime is 634779679. The reversal of 634779663 is 366977436.

It is not a de Polignac number, because 634779663 - 2¹⁴ = 634763279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634779623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67156 + ... + 76022.

It is an arithmetic number, because the mean of its divisors is an integer number (41112048).

Almost surely, 2^634779663 is an apocalyptic number.

634779663 is a deficient number, since it is larger than the sum of its proper divisors (351909489).

634779663 is a wasteful number, since it uses less digits than its factorization.

634779663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9371 (or 9364 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 51.

The square root of 634779663 is about 25194.8340538294. The cubic root of 634779663 is about 859.4243772894.

The spelling of 634779663 in words is "six hundred thirty-four million, seven hundred seventy-nine thousand, six hundred sixty-three".